Background
He was the son of Gerard III, Count of Guelders and Margaretha of Brabant.
He was the son of Gerard III, Count of Guelders and Margaretha of Brabant.
After Count William II (1227–1256) was slain in 1256 by Frisians his two-year-old son Floris V, Count of Holland inherited Holland. At the battle of Reimerswaal on 22 January 1263, Count Otto II defeated Aleidis and was chosen regent by the nobles who opposed Aleidis. Otto II served as Floris V"s guardian until he was twelve years old (1266) and considered capable of administering Holland himself.
Otto II, Count of Guelders was the son of Gerard III, Count of Guelders and Margaretha of Brabant.
Otto first married Margaret of Cleves in 1240. They had two children:
Elizabeth of Guelders, married Adolf VIII of Berg
Margaret of Guelders, married Enguerrand IV, Lord de Coucy
Reginald I, Count of Guelders
Phillipa of Guelders, married Waleran II, Lord of Valkenburg.
Margaret of Guelders, married Dietrich VI, Count of Cleves. Maria of Guelders.